1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
|
/* -*- Mode: C ; c-basic-offset: 2 -*- */
/*
* LADI Session Handler (ladish)
*
* Copyright (C) 2005 - 2008 Jaco Kroon <jaco@kroon.co.za>
*
**************************************************************************
* This file contains code to print out a stack-trace when program segfaults.
**************************************************************************
*
* LADI Session Handler is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* LADI Session Handler is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with LADI Session Handler. If not, see <http://www.gnu.org/licenses/>
* or write to the Free Software Foundation, Inc.,
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#define NO_CPP_DEMANGLE
#define SIGSEGV_NO_AUTO_INIT
#ifndef _GNU_SOURCE
# define _GNU_SOURCE
#endif
#include <memory.h>
#include <stdlib.h>
#include <stdio.h>
#include <signal.h>
#include <ucontext.h>
#include <dlfcn.h>
#include <execinfo.h>
#include <errno.h>
#ifndef NO_CPP_DEMANGLE
//#include <cxxabi.h>
char * __cxa_demangle(const char * __mangled_name, char * __output_buffer, size_t * __length, int * __status);
#endif
#include "../log.h"
#if defined(REG_RIP)
# define SIGSEGV_STACK_IA64
# define REGFORMAT "%016lx"
#elif defined(REG_EIP)
# define SIGSEGV_STACK_X86
# define REGFORMAT "%08x"
#else
# define SIGSEGV_STACK_GENERIC
# define REGFORMAT "%x"
#endif
#if defined(__arm__) || defined(__powerpc__) || defined (__ia64__) || defined (__alpha__) || defined (__FreeBSD_kernel__) || defined (__sh__)
# define DISABLE_STACKTRACE
#endif
static void signal_segv(int signum, siginfo_t* info, void*ptr) {
static const char *si_codes[3] = {"", "SEGV_MAPERR", "SEGV_ACCERR"};
#if !defined(DISABLE_STACKTRACE)
size_t i;
ucontext_t *ucontext = (ucontext_t*)ptr;
#if defined(SIGSEGV_STACK_X86) || defined(SIGSEGV_STACK_IA64)
int f = 0;
Dl_info dlinfo;
void **bp = 0;
void *ip = 0;
#else
void *bt[20];
char **strings;
size_t sz;
#endif
#endif
if (signum == SIGSEGV)
{
log_error("Segmentation Fault!");
}
else if (signum == SIGABRT)
{
log_error("Abort!");
}
else if (signum == SIGILL)
{
log_error("Illegal instruction!");
}
else if (signum == SIGFPE)
{
log_error("Floating point exception!");
}
else
{
log_error("Unknown bad signal catched!");
}
log_error("info.si_signo = %d", signum);
log_error("info.si_errno = %d", info->si_errno);
log_error("info.si_code = %d (%s)", info->si_code, si_codes[info->si_code]);
log_error("info.si_addr = %p", info->si_addr);
#if defined(DISABLE_STACKTRACE)
log_error("No stack trace");
#else
for(i = 0; i < NGREG; i++)
log_error("reg[%02d] = 0x" REGFORMAT, i, ucontext->uc_mcontext.gregs[i]);
#if defined(SIGSEGV_STACK_X86) || defined(SIGSEGV_STACK_IA64)
# if defined(SIGSEGV_STACK_IA64)
ip = (void*)ucontext->uc_mcontext.gregs[REG_RIP];
bp = (void**)ucontext->uc_mcontext.gregs[REG_RBP];
# elif defined(SIGSEGV_STACK_X86)
ip = (void*)ucontext->uc_mcontext.gregs[REG_EIP];
bp = (void**)ucontext->uc_mcontext.gregs[REG_EBP];
# endif
log_error("Stack trace:");
while(bp && ip) {
if(!dladdr(ip, &dlinfo))
break;
const char *symname = dlinfo.dli_sname;
#ifndef NO_CPP_DEMANGLE
int status;
char *tmp = __cxa_demangle(symname, NULL, 0, &status);
if(status == 0 && tmp)
symname = tmp;
#endif
log_error("% 2d: %p <%s+%u> (%s)",
++f,
ip,
symname,
(unsigned)(ip - dlinfo.dli_saddr),
dlinfo.dli_fname);
#ifndef NO_CPP_DEMANGLE
if(tmp)
free(tmp);
#endif
if(dlinfo.dli_sname && !strcmp(dlinfo.dli_sname, "main"))
break;
ip = bp[1];
bp = (void**)bp[0];
}
#else
log_error("Stack trace (non-dedicated):");
sz = backtrace(bt, 20);
strings = backtrace_symbols(bt, sz);
for(i = 0; i < sz; ++i)
log_error("%s", strings[i]);
#endif
log_error("End of stack trace");
#endif
exit (-1);
}
int setup_sigsegv() {
struct sigaction action;
memset(&action, 0, sizeof(action));
action.sa_sigaction = signal_segv;
action.sa_flags = SA_SIGINFO;
if(sigaction(SIGSEGV, &action, NULL) < 0) {
log_error("sigaction failed. errno is %d (%s)", errno, strerror(errno));
return 0;
}
if(sigaction(SIGILL, &action, NULL) < 0) {
log_error("sigaction failed. errno is %d (%s)", errno, strerror(errno));
return 0;
}
if(sigaction(SIGABRT, &action, NULL) < 0) {
log_error("sigaction failed. errno is %d (%s)", errno, strerror(errno));
return 0;
}
if(sigaction(SIGFPE, &action, NULL) < 0) {
log_error("sigaction failed. errno is %d (%s)", errno, strerror(errno));
return 0;
}
return 1;
}
#ifndef SIGSEGV_NO_AUTO_INIT
static void __attribute((constructor)) init(void) {
setup_sigsegv();
}
#endif
|
